气候变化领域集成服务门户(CCPortal): Bottom mixed layer oxygen dynamics in the Celtic Sea

CCPortal

DOI	10.1007/s10533-020-00662-x
	Bottom mixed layer oxygen dynamics in the Celtic Sea
	Hull T.; Johnson M.; Greenwood N.; Kaiser J.
发表日期	2020
ISSN	0168-2563
英文摘要	The seasonally stratified continental shelf seas are highly productive, economically important environments which are under considerable pressure from human activity. Global dissolved oxygen concentrations have shown rapid reductions in response to anthropogenic forcing since at least the middle of the twentieth century. Oxygen consumption is at the same time linked to the cycling of atmospheric carbon, with oxygen being a proxy for carbon remineralisation and the release of CO2. In the seasonally stratified seas the bottom mixed layer (BML) is partially isolated from the atmosphere and is thus controlled by interplay between oxygen consumption processes, vertical and horizontal advection. Oxygen consumption rates can be both spatially and temporally dynamic, but these dynamics are often missed with incubation based techniques. Here we adopt a Bayesian approach to determining total BML oxygen consumption rates from a high resolution oxygen time-series. This incorporates both our knowledge and our uncertainty of the various processes which control the oxygen inventory. Total BML rates integrate both processes in the water column and at the sediment interface. These observations span the stratified period of the Celtic Sea and across both sandy and muddy sediment types. We show how horizontal advection, tidal forcing and vertical mixing together control the bottom mixed layer oxygen concentrations at various times over the stratified period. Our muddy-sand site shows cyclic spring-neap mediated changes in oxygen consumption driven by the frequent resuspension or ventilation of the seabed. We see evidence for prolonged periods of increased vertical mixing which provide the ventilation necessary to support the high rates of consumption observed. © 2020, The Author(s).
英文关键词	Bayesian model; Benthic biogeochemistry; Deoxygenation; Horizontal advection; Oxygen consumption; Shelf Sea; Total oxygen uptake
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153171
作者单位	Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, United Kingdom; Centre for Ocean and Atmospheric Science, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
推荐引用方式 GB/T 7714	Hull T.,Johnson M.,Greenwood N.,et al. Bottom mixed layer oxygen dynamics in the Celtic Sea[J],2020.
APA	Hull T.,Johnson M.,Greenwood N.,&Kaiser J..(2020).Bottom mixed layer oxygen dynamics in the Celtic Sea.Biogeochemistry.
MLA	Hull T.,et al."Bottom mixed layer oxygen dynamics in the Celtic Sea".Biogeochemistry (2020).